In Order to form a more perfect Union that means to have states staying together, so they can operate as a single nation.
Answer:
The Battle Of Antietam
Explanation:
The South won every major Civil War battle until "a. the Battle of Antietam," since this took place on Union soil for the first time during the War--giving the Union a "home town" advantage.
The Doctrine that eased Cold War tensions was the Nixon doctrine
